Design Of Solar Thermal Storage Facility For 50 Mw Solar Thermal Power Plant

Abstract

The energy received from the sun is plentiful to satisfy every one of the prerequisites of humankind, however that energy is discontinuous, frequently capricious and diffused. Because of discontinuity of the sun oriented power, it is hard to match control delivered from this source with different burdens like residential, mechanical and business. For settling the power conveyance and to expand the day by day working hours of the plant, it can be either consolidated with ordinary power plant or separate thermal energy storage framework can be made for the plant. Thermal energy storage is not another idea; it has been utilized for quite a long time and assumes a vital part in energy preservation. Concentrated Solar Power (CSP) plants which are as of now being used, utilizes oil as a heat transfer fluid and molten salt as the thermal energy storage fluid. As per recent developments in industrial practices, utilization of oil as heat exchange fluid (HTF) is confined, as it can burst into flames and begin contaminating over its maximum utmost temperature which is 390ºC. Additionally recent research proposed the utilization of liquid salt (molten salt) as heat transfer fluid (HTF) and thermal energy storage (TES) fluid. Utilization of liquid salt as a HTF and TES fluid will expand the aggregate cost of plants, as it is having a high solidification point (238ºC) contrasted with oil (12ºC). The higher cost is due to requiring special freeze protection system in sunlight based field channeling and in thermal energy storage framework. Researchers have developed a new thermal energy storage material (LiNO3-NaNO3-KNO3) which have low solidification temperature and have better thermodynamic properties at higher temperatures when contrasted with salt currently used. Use of this material in TES will help to increase operating temperature of TES system. It also have higher energy density which will be helpful to optimize the tank size and amount of storage salt required. This thesis contains the designing of the thermal energy storage facility with liquid salt (molten salt) as heat transfer fluid and new ternary eutectic salt as thermal energy storage fluid in solar thermal power plant. Thesis principally manages the designing of storage tanks for thermal energy storage, designing of heat protection framework, heat loss estimation for various ambient conditions and tank heater sizing to maintain the minimum required temperature in the cold tank.